Measurement & Project Planning calculator
Grade Calculator
Calculate grade percentage from vertical elevation change and horizontal distance.
Calculate grade percentage from vertical elevation change and horizontal distance. The tool is designed for transparent planning: you can see the measurements, product assumptions and allowance that drive the result. Review rise versus horizontal run before ordering or setting out. Use horizontal run rather than distance along the slope. A percentage grade and an angle are different representations of the same rise-to-run relationship.
What you need to enter
The Grade Calculator uses the following project information to calculate the result.
- Rise
- Run
Calculator result
Slope percentage, ratio and angle
How the Grade Calculator works
This page is built around rise ÷ run expressed in multiple formats. Applied to grade percentage from vertical change and horizontal distance, the engine first converts compatible measurements to a common basis and then calculates slope percentage, ratio and angle. Verify rise versus horizontal run before treating the output as a buying, sizing or set-out figure.
Grade Calculator worked example
Grade Calculator example: A 0.5 m rise over a 10 m horizontal run is a 5% grade and an angle of about 2.86°. The grade expresses the same geometry in the formats commonly used for setting out. This example shows the arithmetic only; on a live job, review rise versus horizontal run before turning the result into an order or final size.
Important calculation assumptions
For grade percentage from vertical change and horizontal distance, use horizontal run rather than distance along the slope. A percentage grade and an angle are different representations of the same rise-to-run relationship.
Frequently asked questions
How is grade percentage calculated?
Grade percent equals vertical elevation change divided by horizontal distance, multiplied by 100. A 0.5 m rise over 10 m is therefore a 5% grade.
Can grade be negative?
Yes. A negative value simply indicates the direction falls relative to your chosen start point. The magnitude describes how steep the fall is.
Is a 5% grade the same as a 5-degree angle?
No. Five percent grade is only about 2.86 degrees. Percentage and degrees use different scales even though both describe the same rise-to-run geometry.